Analysis
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max time kernel
149s -
max time network
155s -
platform
windows7_x64 -
resource
win7 -
submitted
08-07-2020 15:40
Static task
static1
Behavioral task
behavioral1
Sample
DocumentPreview.exe
Resource
win7
Behavioral task
behavioral2
Sample
DocumentPreview.exe
Resource
win10v200430
General
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Target
DocumentPreview.exe
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Size
146KB
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MD5
db3c2530d727bac602e6c41cb3e60562
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SHA1
0d62d5a5fba84c1e826591f27892466a1cd59257
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SHA256
e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1
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SHA512
03e25d32a262c88ec2cf9303b7835da93b321a1d2a092531c96df8d95065944250f63c075792ca72b6d2a12d60c492782ba516712fbca0bf3b0239477b6b06e8
Malware Config
Extracted
buer
https://162.244.81.87/
http://162.244.81.87:8080/
Signatures
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Modifies WinLogon for persistence 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\563b2a5942b492d3dbe0\\gennt.exe\"" gennt.exe -
Buer Loader 1 IoCs
Detects Buer loader in memory or disk.
resource yara_rule behavioral1/memory/1496-0-0x0000000000030000-0x000000000003C000-memory.dmp buer -
Executes dropped EXE 1 IoCs
pid Process 1904 gennt.exe -
Deletes itself 1 IoCs
pid Process 1904 gennt.exe -
Loads dropped DLL 1 IoCs
pid Process 1496 DocumentPreview.exe -
Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
description ioc Process File opened (read-only) \??\B: gennt.exe File opened (read-only) \??\F: gennt.exe File opened (read-only) \??\G: gennt.exe File opened (read-only) \??\K: gennt.exe File opened (read-only) \??\P: gennt.exe File opened (read-only) \??\S: gennt.exe File opened (read-only) \??\W: gennt.exe File opened (read-only) \??\A: gennt.exe File opened (read-only) \??\H: gennt.exe File opened (read-only) \??\N: gennt.exe File opened (read-only) \??\R: gennt.exe File opened (read-only) \??\T: gennt.exe File opened (read-only) \??\U: gennt.exe File opened (read-only) \??\V: gennt.exe File opened (read-only) \??\X: gennt.exe File opened (read-only) \??\E: gennt.exe File opened (read-only) \??\Y: gennt.exe File opened (read-only) \??\L: gennt.exe File opened (read-only) \??\M: gennt.exe File opened (read-only) \??\O: gennt.exe File opened (read-only) \??\Z: gennt.exe File opened (read-only) \??\I: gennt.exe File opened (read-only) \??\Q: gennt.exe File opened (read-only) \??\J: gennt.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Program crash 1 IoCs
pid pid_target Process procid_target 1876 1812 WerFault.exe 29 -
Suspicious behavior: EnumeratesProcesses 5 IoCs
pid Process 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1904 gennt.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 1876 WerFault.exe -
Suspicious use of WriteProcessMemory 23 IoCs
description pid Process procid_target PID 1496 wrote to memory of 1904 1496 DocumentPreview.exe 27 PID 1496 wrote to memory of 1904 1496 DocumentPreview.exe 27 PID 1496 wrote to memory of 1904 1496 DocumentPreview.exe 27 PID 1496 wrote to memory of 1904 1496 DocumentPreview.exe 27 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1904 wrote to memory of 1812 1904 gennt.exe 29 PID 1812 wrote to memory of 1876 1812 secinit.exe 30 PID 1812 wrote to memory of 1876 1812 secinit.exe 30 PID 1812 wrote to memory of 1876 1812 secinit.exe 30 PID 1812 wrote to memory of 1876 1812 secinit.exe 30 PID 1904 wrote to memory of 1584 1904 gennt.exe 31 PID 1904 wrote to memory of 1584 1904 gennt.exe 31 PID 1904 wrote to memory of 1584 1904 gennt.exe 31 PID 1904 wrote to memory of 1584 1904 gennt.exe 31
Processes
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C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe"C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1496 -
C:\ProgramData\563b2a5942b492d3dbe0\gennt.exeC:\ProgramData\563b2a5942b492d3dbe0\gennt.exe "C:\Users\Admin\AppData\Local\Temp\DocumentPreview.exe" ensgJJ2⤵
- Modifies WinLogon for persistence
- Executes dropped EXE
- Deletes itself
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1904 -
C:\Windows\SysWOW64\secinit.exeC:\ProgramData\563b2a5942b492d3dbe0\gennt.exe3⤵
- Suspicious use of WriteProcessMemory
PID:1812 -
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 1604⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1876
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\563b2a5942b492d3dbe0}"3⤵PID:1584
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